public byte[] RSMDecrypt(byte[] data, byte[] key)
{
Rfc2898DeriveBytes R = new Rfc2898DeriveBytes(key, new byte[8], 1);

RijndaelManaged T = new RijndaelManaged();
T.Key = R.GetBytes(16);
T.IV = R.GetBytes(16);

byte[] O = T.CreateDecryptor().TransformFinalBlock(data, 0, data.Length);
byte[] U = new byte[O.Length - 16];
Buffer.BlockCopy(O, 16, U, 0, O.Length - 16);

return U;
}